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Genomic characterization and epidemiology of an emerging SARS-CoV-2 variant in Delhi, India.


ABSTRACT: Delhi, the national capital of India, experienced multiple severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreaks in 2020 and reached population seropositivity of >50% by 2021. During April 2021, the city became overwhelmed by COVID-19 cases and fatalities, as a new variant, B.1.617.2 (Delta), replaced B.1.1.7 (Alpha). A Bayesian model explains the growth advantage of Delta through a combination of increased transmissibility and reduced sensitivity to immune responses generated against earlier variants (median estimates: 1.5-fold greater transmissibility and 20% reduction in sensitivity). Seropositivity of an employee and family cohort increased from 42% to 87.5% between March and July 2021, with 27% reinfections, as judged by increased antibody concentration after a previous decline. The likely high transmissibility and partial evasion of immunity by the Delta variant contributed to an overwhelming surge in Delhi.

SUBMITTER: Dhar MS 

PROVIDER: S-EPMC7612010 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature

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Genomic characterization and epidemiology of an emerging SARS-CoV-2 variant in Delhi, India.

Dhar Mahesh S MS   Marwal Robin R   Vs Radhakrishnan R   Ponnusamy Kalaiarasan K   Jolly Bani B   Bhoyar Rahul C RC   Sardana Viren V   Naushin Salwa S   Rophina Mercy M   Mellan Thomas A TA   Mishra Swapnil S   Whittaker Charles C   Fatihi Saman S   Datta Meena M   Singh Priyanka P   Sharma Uma U   Ujjainiya Rajat R   Bhatheja Nitin N   Divakar Mohit Kumar MK   Singh Manoj K MK   Imran Mohamed M   Senthivel Vigneshwar V   Maurya Ranjeet R   Jha Neha N   Mehta Priyanka P   A Vivekanand V   Sharma Pooja P   Vr Arvinden A   Chaudhary Urmila U   Soni Namita N   Thukral Lipi L   Flaxman Seth S   Bhatt Samir S   Pandey Rajesh R   Dash Debasis D   Faruq Mohammed M   Lall Hemlata H   Gogia Hema H   Madan Preeti P   Kulkarni Sanket S   Chauhan Himanshu H   Sengupta Shantanu S   Kabra Sandhya S   Gupta Ravindra K RK   Singh Sujeet K SK   Agrawal Anurag A   Rakshit Partha P   Nandicoori Vinay V   Tallapaka Karthik Bharadwaj KB   Sowpati Divya Tej DT   Thangaraj K K   Bashyam Murali Dharan MD   Dalal Ashwin A   Sivasubbu Sridhar S   Scaria Vinod V   Parida Ajay A   Raghav Sunil K SK   Prasad Punit P   Sarin Apurva A   Mayor Satyajit S   Ramakrishnan Uma U   Palakodeti Dasaradhi D   Seshasayee Aswin Sai Narain ASN   Bhat Manoj M   Shouche Yogesh Y   Pillai Ajay A   Dikid Tanzin T   Das Saumitra S   Maitra Arindam A   Chinnaswamy Sreedhar S   Biswas Nidhan Kumar NK   Desai Anita Sudhir AS   Pattabiraman Chitra C   Manjunatha M V MV   Mani Reeta S RS   Arunachal Udupi Gautam G   Abraham Priya P   Atul Potdar Varsha PV   Cherian Sarah S SS  

Science (New York, N.Y.) 20211014 6570


Delhi, the national capital of India, experienced multiple severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreaks in 2020 and reached population seropositivity of >50% by 2021. During April 2021, the city became overwhelmed by COVID-19 cases and fatalities, as a new variant, B.1.617.2 (Delta), replaced B.1.1.7 (Alpha). A Bayesian model explains the growth advantage of Delta through a combination of increased transmissibility and reduced sensitivity to immune responses generated a  ...[more]

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